ring: support freeing

[dpdk.git] / lib / librte_ring / rte_ring.c

diff --git a/lib/librte_ring/rte_ring.c b/lib/librte_ring/rte_ring.c
index 4e78e14..d80faf3 100644 (file)
--- a/lib/librte_ring/rte_ring.c
+++ b/lib/librte_ring/rte_ring.c
@@ -1,7 +1,7 @@
 /*-
  *   BSD LICENSE
  *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -209,6 +209,51 @@ rte_ring_create(const char *name, unsigned count, int socket_id,
        return r;
 }
 
+/* free the ring */
+void
+rte_ring_free(struct rte_ring *r)
+{
+       struct rte_ring_list *ring_list = NULL;
+       struct rte_tailq_entry *te;
+
+       if (r == NULL)
+               return;
+
+       /*
+        * Ring was not created with rte_ring_create,
+        * therefore, there is no memzone to free.
+        */
+       if (r->memzone == NULL) {
+               RTE_LOG(ERR, RING, "Cannot free ring (not created with rte_ring_create()");
+               return;
+       }
+
+       if (rte_memzone_free(r->memzone) != 0) {
+               RTE_LOG(ERR, RING, "Cannot free memory\n");
+               return;
+       }
+
+       ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+       rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+
+       /* find out tailq entry */
+       TAILQ_FOREACH(te, ring_list, next) {
+               if (te->data == (void *) r)
+                       break;
+       }
+
+       if (te == NULL) {
+               rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+               return;
+       }
+
+       TAILQ_REMOVE(ring_list, te, next);
+
+       rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+       rte_free(te);
+}
+
 /*
  * change the high water mark. If *count* is 0, water marking is
  * disabled